October is a fitting month for stories about old houses, and the Main Line has plenty of them. Stone colonials, Victorians, and twins from Narberth to Paoli all make sounds as the heat comes on. Most have ordinary explanations.
Before tracking one down, note when it happens, where it seems to come from, and what else was going on.
Why Older Homes Creak and Pop
Wood framing, plank floors, and plaster expand and contract with temperature and humidity. Older homes tend to be more talkative, especially once heating season dries the air. New cracks in plaster, sticking doors, or soft floors are worth a professional look.
Radiators and Steam Pipes
Hot water radiators can gurgle or knock when air is trapped, and bleeding them often helps. Steam systems hiss and clank as they heat, and loud banging often means water is collecting in the pipes. A heating technician familiar with older systems can check pipe pitch and vents.
Plumbing Noises
A bang after the washer shuts off is often water hammer. Running water when nothing is on deserves a meter check.
Oil Burner and Furnace Sounds
Oil burners rumble at ignition. Gas furnaces click and whoosh. New grinding, squealing, or a loud puff at startup is worth a call. If you smell gas, leave and call PECO or 911 from outside. If a carbon monoxide alarm sounds, get everyone out.
Wind and Old Windows
Wind finds gaps around original windows, doors, and attic hatches. Storm windows and shutters can rattle, and branches from mature trees often brush the roof.
Squirrels, Mice, and Bats
Squirrels are active during the day and love older attics. Mice are active at night. Bats sometimes roost in attics and chimneys. A licensed wildlife professional can help.
What to Tell the Professional
Describe the sound, where and when you hear it, and what else is running. "The steam pipe in the dining room bangs for five minutes after the boiler starts" gives a technician a clear starting point.
If you'd like a recommendation for a local plumber, heating technician, or wildlife professional, just ask. We're happy to share names we know.
Frequently Asked Questions
Why do steam pipes bang?
Water collecting in pipes is a common cause.
Why do hot water radiators gurgle?
Trapped air is common. Bleeding them helps.
Why does my old house creak more in winter?
Dry heated air causes wood to shrink slightly.
Are bats common in Main Line attics?
They can be. Call a licensed professional.
What should I do if I smell gas?
Leave and call PECO or 911 from outside.
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